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What is one question would you like to ask a time traveler from 1000 years in the future?

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What is one question you would like to ask a time traveler from 1000 years in the future?

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  • Is Trump still President? Commented Aug 19, 2020 at 20:02

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Both would you and you would can be grammatical, but only in different specific constructions.

Without is:

✔ What one question would you like to ask a time traveler from 1000 years in the future?
✘ What one question you would like to ask a time traveler from 1000 years in the future?

With is:

✘ What is one question would you like to ask a time traveler from 1000 years in the future?
✔ What is one question you would like to ask a time traveler from 1000 years in the future?

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